JPH03182745A - Photographic film cartridge and camera using the photographic film cartridge - Google Patents

Abstract

PURPOSE:To execute the display of used at the time point when a film is fed by providing a film container, two pieces of external terminals, and a switching means for switching irreversibly the part between two pieces of external terminals by a rotation of a spool. CONSTITUTION:In the inside consisting of a cartridge body 3 and a cover 4 formed by plastic having a light shielding property, an unexposed film 5 is contained lighttightly. The cartridge is provided with two pieces of external terminals 15, 16 separated from each other and exposed on an outer wall of its film container 3, and a switching means which is provided in the film container 3 and switches irreversibly the part between two pieces of external terminals 15, 16 by a rotation of a spool 6. This switching means can execute only single switching, therefore, the external terminals hold a connected or cut-off state. In such a way, by detecting a film feed, the display of use/unuse is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film cartridge for storing film and a camera using the photographic film cartridge.

[Conventional technology]

Some cameras that are used with a 135 film cartridge are loaded with the film, and when the film is rewound after taking a picture, even the leading edge of the film is completely wound into the cartridge body. In film cartridges used in such cameras, the leading edge of the film gets rolled up inside the cartridge body after use, so it is necessary to determine whether or not the film has been shot by whether or not the leading edge of the film has come out of the cartridge body. I can do it.

On the other hand, in consideration of the workability of film development processing, there is also a camera in which the leading end of the film is not completely wound into the cartridge body even when the film is rewound. When a film cartridge is loaded and used in such a camera, the leading edge of the film still protrudes from the cartridge body even after use, so it is difficult to determine whether or not the film has been shot just by looking at the film cartridge. The problem is that it cannot be done.

Also, recently, US Pat. No. 4,832,275.

As disclosed in Publications No. 4834306 and No. 4846418, in order to simplify the loading operation into the camera, the leading end of the film is stored inside the cartridge body even when unused. A film cartridge has been proposed in which the leading end of the film can be fed out of the cartridge body by rotating the spool using a mechanism on the camera side. In such a film cartridge, if the leading end of the film is wound into the cartridge body by rewinding the film, it becomes impossible to determine whether or not the film has been photographed.

The film cartridge described in JP-A-58-121027 is equipped with a detection piece on the outer wall of the cartridge body.
When the cartridge main body is loaded into the camera, the detection piece is bent, and its mechanical deformation is detected by a switch on the camera side, so that it can be determined that the cartridge has been used.

[Problem to be solved by the invention]

However, in the film cartridge described in Japanese Patent Application Laid-open No. 58-121027, the detection piece is bent at the beginning of loading, so if you change your mind and take it out during loading,
If this was to be reloaded at a later date, there was a problem in that it would be mistaken as a used item even though it was unused.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a photographic film cartridge that detects film feeding and displays whether it is used or not, and a camera that uses the photographic film cartridge. do.

[Means to solve the problem]

In order to achieve the above object, the photographic film cartridge of the present invention includes a film container that rotatably supports a spool on which a film is wound and that stores the film in a light-tight manner, and a film container that is spaced apart from each other on the outer wall of the film container. and a switching means provided in the film container for irreversibly switching between the two external terminals by rotation of the spool.

In another invention, a pair of contact members each contacting the external terminal when the photographic film cartridge is loaded, a detection means for detecting conduction/non-conduction between these contact members, and a detection means from the detection means. and determining means for determining whether the photographic film cartridge is used or not, based on the signal.

[Effect]

According to the above configuration, the switching means connects or disconnects the external terminals by rotating the spool. Since this switching means can perform only one switching, the external terminal maintains a connected or disconnected state.

In another aspect of the invention, the detection means detects continuity between the external terminals of the loaded photographic film cartridge through the contact member, and outputs a signal to the determination means. Thereafter, the determining means determines whether the photographic film cartridge is used or not, based on the signal from the detecting means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a photographic film cartridge of the present invention and a camera using the photographic film cartridge will be described with reference to the drawings.

〔Example〕

1 and 2 show a first embodiment of the photographic film cartridge of the present invention. This photographic film cartridge 2 consists of a cartridge body 3 whose bottom is made of light-shielding plastic and a lid 4, and an unexposed film 5 inside it.
is stored in a light-tight manner. This film 5 is wound around a spool 6 with one end fixed. This spool 6
is rotatably supported by the cartridge main body 3 and M4.

Additionally, flanges 7.8 are provided at both ends of the spool 6, respectively.
This flange 7.degree. 8 blocks light from outside and prevents the spool 6 from falling out of the photographic film cartridge 2. In addition,
Both ends of the spool 6 do not protrude from the photographic film cartridge 2 and are housed within its outline, so that the user cannot easily turn it with his/her fingers.

A protrusion 9 whose tip abuts against M4 is integrally formed on the flange 7. The tip of this protrusion 9 has a sharp shape, and when the spool 6 is rotated, it cuts the aluminum foil attached to the inside of the lid 4, which will be described later. After cutting several times, the protrusion 9 cuts the aluminum foil. In this embodiment, the tip of the protrusion 9 has a sharp shape, but it may have a shape that has an abrasive effect like sandpaper.

A drawer opening 10 through which the film 5 enters and exits is formed on the outer periphery of the cartridge main body 3. A well-known telescope 11 is attached to this drawer opening 10, and this telescope 11 blocks external light from the drawer opening IO. Inside the cartridge main body 3, there are a pair of elastic bodies 12 that prevent the film 5 from unwinding, and a tip separation claw 13 that slides on the outer peripheral surface of the film 5 and peels off the tip of the rotated film 5. is provided. In this state, when the spool 6 is rotated clockwise in FIG. 2, the leading end of the film 5 is rotated clockwise in conjunction with the rotation of the spool 6. Thereafter, the leading end of the film 5 is peeled off from the outer circumferential surface of the film 5 by the leading end separating claw 13, sent toward the drawer opening 10, passed between the telescopes 11, and sent out of the cartridge main body 3.

A pair of electrically conductive terminals 15 and 16 are embedded and molded in the lid 4. These terminals 15 and 16 are connected to an aluminum foil 17 with a thickness of 20 μm attached to the inside of the lid 4 as shown in FIG.

In this embodiment, the terminals 15 and 16 are connected with aluminum foil 17, but in addition to the aluminum foil 17, a thin film of metal such as copper, silver, or iron is used, and the film base is made of aluminum.

Even if the connection is made of metals such as gold, lead, or nickel, metal oxides or sulfides such as tin oxide, indium oxide, zinc oxide, cadmium sulfide, etc., or materials coated with organic conductive polymers, good. Furthermore, the connection between the terminals 15 and 16 can be made using a mist made by dispersing metal, metal oxide, or carbon black in a binder and coating it, or a solution containing a semiconductor compound (for example, copper iodide) that is precipitated during coating. You may go.

FIG. 5 shows a photographic film cartridge of the present invention and a camera in which it is loaded. An exposure opening 22 is formed in the center of the camera body 21 with the back M20 open. A cartridge chamber 23 for housing the photographic film cartridge 2 and a winding chamber 25 in which a winding shaft 24 is provided are formed at both ends of the camera body 21 so as to sandwich the exposure opening 22 therebetween. A pair of film guide sections 28 are placed between the cartridge chamber 23 and the winding chamber 25 so as to sandwich the exposure opening 22 therebetween.

The bottom of the camera body 21 has a cartridge insertion slot 2 for inserting a photographic film cartridge 2 into the cartridge chamber 23.
6 is formed. Further, the cartridge chamber 23 is provided with a fork 27 shown by a broken line in the figure, and this fork 27 fits into the spool 6 and rotates it to feed the film 5. A pair of detection terminals 29a and 29b are provided in the cartridge chamber 23 adjacent to the fork 27. These detection terminals 29a and 29b are provided with spring properties in the direction of the cartridge chamber 23, so that they can surely come into contact with the terminals 15 and 16 of the photographic film cartridge 2 to be loaded.

As shown in FIG. 6, a determination section 30 for monitoring continuity between the terminals 15 and 16 is connected to the detection terminals 29a and 29b. A CPU 31 is connected to this determining section 30, and this CPU 31 controls the initial advance of the film and also determines whether the photographic film cartridge 2 is used or not using a conductive signal or a non-conductive signal outputted from the determining section 30. conduct.

Further, a liquid crystal panel 34 is connected to the CPU 31 via a film feeding section 32 and a driver 33. The film feeding section 32 is provided with drivers 35 and 36,
Hoisting motor 37. A feed motor 38 is connected.

The winding motor 37 connects the winding shaft 24 to the feeding motor 38.
rotate the fork 27, respectively.

As shown in FIG. 5, the back cover 20 is provided with a well-known pressure plate 40 and a guide 41 for engaging the leading end of the film 5 being fed with the winding shaft 24. Also, the back M20
A bottom M42 is attached to shield the cartridge insertion opening 26 from light.

The operation of the photographic film cartridge constructed in this way and the camera into which the photographic film cartridge is loaded will be explained. NM2O is released and an unused photographic film cartridge 2 is loaded into the cartridge chamber 23. At this time, the spool 6 that engages with the fork 27 is pressed against the lid 4 in FIG. 1, so that the tip of the protrusion 9 is pressed against the inside of the lid 4.

After that, when the back cover 20 is closed, the determination unit 30 detects the terminal 1.
Confirm continuity between 5 and 16, and output a continuity signal to the CPU 31. The CPU 31 to which the conduction signal has been output outputs an initial feed signal to the film feeding section 32 and drives the feeding motor 38 via the driver 36. In addition, at this time, CP
The liquid crystal panel 34 may be operated by the U31 via the driver 33, and "unused" may be displayed on the liquid crystal panel 34.

The feed motor 38 rotates the spool 6 clockwise in FIG. 2 via the fork 27.

When the spool 6 is rotated, the leading end of the tightly wound film 5 rotates clockwise within the photographic film cartridge 2, is separated by the leading end separation claw 13, and is fed toward the drawer opening 10. .

Further, when the spool 6 is rotated, the protrusion 9 is rotated while slidingly contacting the inside of the lid 4, and cuts the aluminum foil 17 shown in FIG. 3 when crossing it. According to experiments, when the protrusion 9 cuts the aluminum foil 17 eight times, it cuts as shown in FIG. Therefore, the resistance value between the pair of terminals 15 and 16 increases from 1000Ω to infinity. In addition, in the case where lead is vapor-deposited to a thickness of 0.011 Im on a film base having a thickness of 75 μm, when the protrusion 9 crosses the terminal 5 times, the resistance value between the cut terminals 15° and 16 increases from 1000Ω to infinity.

The film 5 sent out from the drawer opening 10 is fed to the winding chamber 25 via the film guide section 28, and is wound around the rotating winding shaft 24 by the guide section 36. Thereafter, the film feeding unit 32 stops driving the feeding motor 38, drives the winding motor 37, and feeds the film 5 by a certain amount. When the first frame is set in the exposure aperture 22 in this manner, the drive of the winding motor 37 is stopped and the initial feeding of the film 5 is completed. After this, by operating the release button, well-known photography can be performed.

By the way, when the determination section 30 outputs a non-conducting signal to the CPU 31, the CPU 31 does not output a signal to the film feeding section 32, but sends a signal to the liquid crystal panel 34 via the driver 33.
It only displays "Used". If "Used" is displayed, all you have to do is open the back cover 20 and take out the photographic film cartridge 2.

7 and 8 show a second embodiment of the photographic film cartridge of the present invention. A conductive connecting piece 51 is fixed to the terminal 15 that projects into the photographic film cartridge 50. This connecting piece 51 has terminal 1 in the middle.
The other end is supported upwardly by a support piece 52 that slides on the flange 7 so as to be in contact with the flange 6 . This support piece 5
2 is connected to the spool via a thread 53 made of nylon or the like. Further, the connecting piece 51 has a spring property, and when the supporting piece 52 loses support, the contact with the terminal 16 is released.

The operation of the photographic film cartridge 50 configured as described above will be explained. When the spool 6 is rotated to feed the film 5, the thread 53 is wound around the spool 6. Then, when the support piece 52 is pulled in the direction of the spool 6,
The connecting piece 5I deforms so as to cut off contact with the terminal 16. Therefore, continuity between terminals 15 and 16 is lost. Note that the timing of disconnection between the terminals 15 and 16 can be adjusted by changing the length of the thread 53. Further, in this embodiment, the terminals 15 and 16 are left unused when there is continuity between them, but the supporting piece 51 is made into an insulating spacer and is interposed between the terminal 16 and the connecting piece 51. If the thread 53 is pulled out by rotating the spool 6, it is possible to indicate that the thread is used if there is continuity.

FIG. 9 shows a third embodiment of the present invention, in which the inner wall of the cartridge main body 3 is provided with a pair of ribs 55 along the circumferential direction.
56 are integrally formed. These ribs 55, 56
Instead of the elastic body 12, it comes into contact with the outer peripheral surface of the film 5 to prevent it from unraveling. This rib 55, 56
Tip separation claws 57 and 58 are formed in the film 5 to abut against the tip of the film 5 and peel it off from the outer peripheral surface of the film 5. Further, M4 is provided with a pair of the terminals 15 and 16 as in the first embodiment. In the photographic film cartridge 59 constructed in this manner, when the spool 6 is rotated clockwise, the leading end of the film 5 is immediately rotated clockwise. Then, the leading end of the film 5 is separated from the outer circumferential surface by the leading end separating claws 57 and 58, and is fed to the outside of the photographic film cartridge 59 through the drawer opening 10. During this time, the electrical connection between the terminals 15 and 16 is interrupted as described above.

FIG. 10 shows a fourth embodiment of the present invention, in which a pair of protrusions 60 are provided on the inner walls of the cartridge main body 3 and the lid 4.
．． 61 are formed to face each other. This protrusion 60
．． 61 abuts on the flanges 62 and 63 of the spool 6, respectively, and presses and bends them inward. The bent flanges 62 and 63 sandwich both ends of the film 5 to prevent the leading end of the film 5 from peeling off from the outer peripheral surface of the film 5. Therefore, the film 5 is no longer unwound from the spool 6, and the spool 6 can be rotated to perform initial feeding of the film 5.

In the photographic film cartridge 64 configured in this way,
Terminals 15, 16 and aluminum foil 17 similar to those in the first embodiment are provided on the lid 4, and a projection 9 is provided on the spool 6. Therefore, when the film 5 is initially fed, the aperture 17 is cut by the protrusion 9, and the conduction between the terminals 15 and 16 is interrupted.

FIG. 11 shows a fifth embodiment of the present invention, in which a pair of grooves 65 and 66 are formed in the inner wall of the cartridge main body 3 along the circumferential direction as shown. Rings 67 and 68 are fitted into the pair of grooves 65 and 66. These rings 67, 68 are in contact with the outer peripheral surface of the film 5 and press it to prevent it from unraveling.

Then, when the spool 6 is rotated and the leading end of the film 5 is rotated upward in the figure, the leading end of the film 5 is moved to the ring 67.
．． The film 5 is released from the pressure of the film 68, is peeled off from the outer circumferential surface of the film 5 by the tip separation claws 57 and 58, and is sent out in the direction of the drawer opening. In the photographic film cartridge 69 which performs initial film feeding in this manner, the lid 4 is provided with terminals 15, 16 and aluminum foil 17 similar to those in the first embodiment, and the spool 6 is provided with a protrusion 9. Therefore, when the film 5 is initially fed, the aluminum ξM17 is cut by the protrusion 9, and the conduction between the terminals 15 and 16 is interrupted.

FIG. 12 shows a sixth embodiment of the present invention, and in this photographic film cartridge 70, flanges 71, 72
Along the outer periphery, claws 73 and 74 are provided that protrude inward. These claws 73 and 74 abut against the outer peripheral surface of the film 5 to prevent it from unwinding. These claws 73 and 74 come into contact with the sides of the tip separation claws 57 and 58, and are bent outward as shown. Therefore, the leading edge of the film 5 is rotated, and the leading edge separating claw 57.
When it comes into contact with the film 58, its tip is released from the restriction of the claws 73, 74, is peeled off from the outer peripheral surface of the film 5, and is sent out in the direction of the drawer opening. In the photographic film cartridge 70 which performs initial film feeding in this manner, the lid 4 is provided with terminals 15 and 16 and aluminum foil 17 similar to those in the first embodiment, and the spool 6 is provided with a protrusion 9. Therefore, when the film 5 is initially fed, the aluminum foil 17 is cut by the protrusion 9, and the conduction between the terminals 15 and 16 is interrupted.

13 and 14 show a seventh embodiment of the present invention, and the spool 7 of this photographic film cartridge 75 is shown in FIG.
6 consists of two spool pieces 77 and 78. The cylindrical shaft 79 of this spool piece 77 has a shaft 80 of the spool piece 78.
is inserted so that it can slide freely. A protrusion 79a is formed on the outer peripheral surface of the shaft 79, and the protrusion 79a is fitted into a groove formed in the lid 4. Further, the tip of the shaft 80 is engaged with the tip of a slope 81 formed on the shaft 79, as shown in FIG. It is maintained. Further, the spool pieces 77 and 78 are each provided with flanges 82 and 83 whose outer peripheries are slightly recessed inward. Further, ribs 84 and 85 are provided along the circumferential direction on the inner wall of the cartridge main body 3.
is formed. These ribs 84, 85 are connected to the spool piece 7.
It comes into contact with the outer circumferential surface of the film 5 wound around the film 7 to prevent it from unwinding.

Therefore, when the spool piece 77 is rotated, the film 5
The tip of the cartridge is sent out of the cartridge main body 3 as in the fourth embodiment. Then, when the spool piece 77 is rotated, the spool piece 78 slides to the left in the figure by a cam groove (not shown), and the tip of the shaft 80 moves toward the shaft 7 as shown in FIG.
9 engages with the entire slope 81. After this, the spool 76 is in a contracted state as a whole and holds both ends of the film 5. Therefore, after the film 5 is fed out of the cartridge main body 3, the outer peripheral surface of the film 5 is exposed to the ribs 84, 85.
Even if it does not come into contact with , it will not unwind as shown in the figure.

In the photographic film cartridge 75 that performs initial film feeding in this way, terminals 15 and 16 and aluminum foil 17 similar to those in the first embodiment are provided on the lid 4, and the spool 76
is provided with a protrusion 9. Therefore, when the film 5 is initially fed, the aluminum foil 17 is cut by the protrusion 9.
Continuity between terminals 15 and 16 is interrupted. Above, an example in which the aluminum foil 17 is cut by the protrusion 9 has been described for the five embodiments shown in FIGS. 9 to 14, but these embodiments also have the same structure as the second embodiment, It is also possible to cut off between 15 and 16.

Furthermore, although insulating plastic was used as the material for the cartridge main body 3 in the above embodiment, the present invention is also applicable to conventional cartridges in which the material is metal and the tip of the film protrudes outside the cartridge main body. can do. In the case of this metallic cartridge, it is necessary to insulate the terminals 15, 16 and the aluminum foil 17 from the cartridge main body 3. In addition, in this embodiment, the terminals 15 and 16 are M4
However, it may be provided in a portion other than M4, for example, on the outer wall of the cartridge main body 3.

〔Effect of the invention〕

As described above in detail, the photographic film cartridge of the present invention includes a film container that rotatably supports a spool wound with film and stores the film in a light-tight manner, and a film container that is spaced apart from each other on the outer wall of the film container. The film is equipped with two exposed external terminals and a switching means for irreversibly switching between the two external terminals by rotation of the spool. Since it is displayed as completed,
There will be no false indication of used status.

In addition, in a camera of another invention, there is a contact member that contacts each of the two external terminals mentioned above, and a conduction/conduction between the contact members.
Since a detection means for detecting non-conductivity and a determination means for determining whether the photographic film cartridge is used or not based on a signal from the detection means are provided, it is possible to determine whether the loaded photographic film cartridge is used or not. I can do it.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of the photographic film cartridge of the present invention. FIG. 2 is a sectional view of the first embodiment. 3 and 4 are explanatory diagrams showing the state of the lid before and after film feeding. FIG. 5 is a perspective view showing the photographic film cartridge shown in FIG. 1 and the camera of the present invention loaded with this photographic film cartridge. FIG. 6 is a block diagram showing the electrical configuration of the camera shown in FIG. 5. FIG. 7 is a plan view showing a main part of a photographic film cartridge according to a second embodiment of the present invention in a cutaway manner. FIG. 8 is a plan view showing essential parts of a second embodiment of the present invention. FIG. 9 is a partially cutaway perspective view of a main part of a third embodiment of the present invention. FIG. 10 is a sectional view showing a fourth embodiment of the present invention. FIG. 11 is a sectional view showing a fifth embodiment of the present invention. FIG. 12 is a sectional view showing a sixth embodiment of the present invention. FIGS. 13 and 14 are cross-sectional views showing a seventh embodiment of the present invention. Photographic film cartridge Patrone main body Film spool protrusion 13, 57, 58...Tip separating claw 15, 16...Terminal 17...Aluminum foil 21...Camera 23...Patrone loading chamber 29a, 29b... - Connection terminal 30...determination section 31...cpu. 3 (/G Torrone j integrated) Figure 3 Figure 4 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 0 Figure 13 Figure 7 Page 14

Claims (2)

[Claims] (1) A spool around which a film is wound, a film container that rotatably supports the spool and stores the film in a light-tight manner, and two parts exposed at a distance from each other on the outer wall of the film container. an external terminal provided in the film container and connected to the second terminal by rotation of the spool;
1. A photographic film cartridge comprising a switching means for irreversibly switching between two external terminals. (2) In a camera using a photographic film cartridge in which a pair of external terminals exposed outside the container are irreversibly switched when a spool wound with film is rotated, the photographic film cartridge is loaded. a pair of contact members that each contact the external terminal when
A camera using a photographic film cartridge, characterized in that it is equipped with a determination means for determining whether it is unused.